bjorng edited this page Oct 13, 2010 · 13 revisions

We use the following branches for Erlang/OTP.


The master branch is only used for releases. It will typically only be updated at the time of a new release.


We only merge tested changes to the dev branch (and simple changes that are obviously correct). You can safely base branches on the dev branch. It will not be rewinded. Typically, everything in the development branch will be included in the next release.

pu (‘proposed updates’)

The pu branch contains everything in the development branch and merges of all topic branches that have not yet graduated to the development branch. There is a web page with an overview of what is currently included: Currently in the ‘pu’ branch.

The pu branch will be rebuilt frequently, so it is bad idea to base branches on it.

We will send out an information email (What is cooking in erlang/otp) about the status of the topics on the pu branch approximately twice a week.

For the examples below, we assume that you have created a remote like this:

git remote add upstream git://

For background on this command, see Forking a project.

What is currently included in the pu branch?

The easiest way to find out what is included in the pu branch is to look at the following web page:

Currently in the ‘pu’ branch

Alternately, using the command line, you can use a command like this:

git log --oneline --first-parent upstream/dev..upstream/pu

to list all topics currently merged into the pu branch.

The output may look like this:

5dba534 Merge branch 'as/c_nc-fix' into pu
7b3cd7d Merge branch 'bg/make_stub_module-fix' into pu
4bf6686 Merge branch 'mh/to_erl-error-messages' into pu
8f1deea Merge branch 'ks/dialyzer-wx-fix' into pu
4ca3b67 Merge branch 'sv/sys_get_status' into pu
c976574b Merge branch 'bd/http_chunk_fix' into pu
6c68df3 Merge branch 'bg/on_load-types' into pu
36f2430 Merge branch 'po/odbc-update-delete-no-rows' into pu
f3ff5fe Merge branch 'ng/readme' into pu
fcd86c8 Merge branch 'egil/misc-egd' into pu
2c2a61d Merge branch 'egil/readme-debug-emulator' into pu

Building using the pu branch

If you just want to build using the pu branch, you don’t need to create a local version of it first. You can just do:

git checkout upstream/pu

and build as usual. If you do create a local branch, note that you will get merge conflicts if you try to update it using git pull. Instead, either do

git branch -f pu upstream/pu

if the current branch is not pu or if the current branch is pu:

git reset --hard upstream/pu

Creating local branches for the topics in pu

To create a local branch for a topic that is included in the pu branch, you can use the following script.

Assuming that you have defined a remote named upstream that points to the erlang/otp repository, you use it like this:

create-topic-branches upstream/dev..upstream/pu

The output will look like:

git branch -f jp/dependencies_makefile 2924df5^2
git branch -f is/mnesia-send-compressed 7912b9c^2
git branch -f yh/fix-re-run-corruption 54077dd^2
git branch -f egil/binary-gc 067c273^2
git branch -f wt/ssl-resume-session 097eab3^2
git branch -f wt/ssl_certreq_send_ca_list 8978d36^2
git branch -f sc/sctp-connect-nowait 9a94e7c^2
git branch -f km/http-host-header-fix cd9cbaa^2
git branch -f va/rb-improvements 62dc0f1^2
git branch -f uw/shell-tab-completion ac66386^2
git branch -f cf/compile_warning_as_error df8ea7a^2
git branch -f cf/epp-macro-overloading f323862^2
git branch -f bg/otp_build-improvements 762faf3^2
git branch -f at/odbc_osx_fix 02b8126^2
git branch -f db/tv_nthtail_fix 51c42b3^2
git branch -f bd/http_chunk_fix 80f97f7^2
git branch -f po/odbc-update-delete-no-rows 438cea4^2

To create only the local branch you are interested, copy and paste the command for the branch and execute it.

You can also pipe the output of create-topic-branches to sh if you would want to create all topic branches:

create-topic-branches upstream/dev..upstream/pu | sh

or you could run the command through grep before invoking the shell. For example:

create-topic-branches upstream/dev..upstream/pu | grep "bg/" | sh